Authorities said non-custodial parents Joshua and Karyn Hakken are armed and dangerous. (NCMEC)

MADEIRA BEACH, Fla. -- Hillsborough, Fla., deputies say the father who abducted his two non-custodial
children in Tampa was last seen taking his family into the Gulf of
Mexico aboard a sailboat.

Police in Pinellas County found the GMC pickup that was part of a multi-state child abduction alert late Thursday night, but the Hakken has still not been located.

The sheriff's office says it is not clear what direction the boat went
after leaving the Johns Pass area, nor do they know if the boat was
still on the water during Thursday's stormy weather.

An AMBER Alert remains in effect throughout most of the southeastern states after authorities said two young children were abducted by their own parents. The children, 2-year-old Chase and 4-year-old Cole Hakken are believed to be with Joshua and Sharyn Hakken. Officials said the parents are believed to be armed and dangerous.

Police said the black 2006 GMC Sierra pickup was found in a parking garage in Madeira Beach late Thursday night.

The Hillsborough County, Fla., Sheriff's Office says the family could be anywhere in the southeast part of the country.

A day after losing custody of Chase and Cole, Joshua Hakken broke into their grandmother's house at around 6:30 a.m. Wednesday.

"He entered the residence, where he tied up the grandmother and then removed the children," said Cpl. Kevin Bodie, a case detective with the Hillsborough County Sheriff's Office.

It happened in what neighbors describe as a quiet neighborhood just as parents were taking their children to school.

"My heart breaks, my heart beaks for everybody in the family, but particularly for those two little boys," said Carla Bolling, who saw all the activity around the grandmother's home on Shady Shores Drive in Tampa.

Hakken was last seen with the children and his wife, Sharyn, in a Black 2006 GMC pickup truck with USF tag number U95-KT. Investigators are not sure if she was part of the kidnapping plot or a victim.

"We do feel that they are in danger due to the nature, the means where they were taken," said Bodie.

Throughout the evening, deputies searched Hakken's home on South Sterling Avenue in South Tampa first with a K-9. Detectives were seen removing several computers to pinpoint his whereabouts.

Late Wednesday afternoon, a warrant was issues for Joshua Hakken's arrest on two counts of kidnapping, two counts of child neglect, two counts of false imprisonment, one count of burglary with batter, and one count of grand theft auto.

The children were originally removed from Hakken's custody last year in Louisiana following multiple drug charges. While in foster care, Joshua Hakken allegedly showed up at the foster care facility waving a gun and began beating on the front door. He fled the scene without his children after he was unable to enter the secured facility.

Anyone with any information regarding the location of the children are asked to immediately dial 911 or call the Hillsborough County Sheriff's Office at 813-247-8200.